Issue 2, 2021

Solvent responses and substituent effects upon magnetic properties of mononuclear DyIII compounds

Abstract

Solvent responsive magnets comprise a class of molecule-based materials where lattice solvent driven structural transformation leads to the switching of magnetic properties. Herein, we present a special type of magnet where single-crystal to single-crystal (SCSC) transformations within mononuclear DyIII compounds result in the switching of DyIII single-molecule magnets (SMMs). This structural transformation involves lattice solvents which leads to significant changes in the color and magnetic properties. Additionally, the relaxation dynamics of mononuclear DyIII compounds are perceptibly fine-tuned by the modification of β-diketonate ligands. The uniaxial magnetic anisotropies, magneto-structural correlations and the relaxation mechanism were investigated by magnetic studies and ab initio calculations. These experimental and theoretical studies indicate that compound 2 exhibits the best magnetic properties in compounds 1–4. The experimental observation is supported by the theoretical prediction of QTM time (τZeeQTM) as theτZeeQTM of 2 is remarkably longer than those of the other three compounds by an order of magnitude. This means that, compared with 1, 3, and 4, the magnetic relaxation of 2 is significantly slower. Meanwhile, 2 has the largest value of axial ESP (the axial electrostatic potential), which supports the smallest gXY value in these compounds, resulting in better SMM properties. The present results offer a systematic synthesis regulation to change the magnetization dynamics and further understand magneto-structural correlations for DyIII SMMs.

Graphical abstract: Solvent responses and substituent effects upon magnetic properties of mononuclear DyIII compounds

Supplementary files

Article information

Article type
Paper
Submitted
08 Oct 2020
Accepted
25 Nov 2020
First published
25 Nov 2020

Dalton Trans., 2021,50, 624-637

Solvent responses and substituent effects upon magnetic properties of mononuclear DyIII compounds

S. Zhang, N. Shen, J. Zhang, F. Xu, J. Zhang, J. Tang, D. Hu, B. Yin and S. Chen, Dalton Trans., 2021, 50, 624 DOI: 10.1039/D0DT03477K

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